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IMPROVED WRENCH.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JAMES E. CRONK, of Poughkeepsie, in the county of Dutchess, and State of New York, haveinvented a new` and useful improvement in Vlrenches; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the saine, reference beinghad to the annexed drawings, making a part of this specification, in which the same letters have reference to the saule parts in each.

Figure 1 represents a side view of the wrench put together ready for use.

Figures 2, 3, and 4 represent the several parts of the wrench, detached.

This invention consists in a novel mode of constructing wrenches wherein one or both parts are impelled forward or backward by means of aneccentric attached to one part and working in a slot or recess in the other part. l

In this example ci' my invention I have shown it applied to a double-jaw wrench, that is to say, a wrench with jaws at either end, but it can be applied also to a single-jaw wrench.

The letters A A designate the bars of the wrench, placed next to each other and held together by means of set-screws D Dfwhich work in slots C C, one of said slots being made in each bar, at its inner end, as Yclearly shown in the drawing. -Each bar has right-angled projections P P at `its ends, which form the jaws of the wrencln The inner end of each bar A- has lips B B, that` embrace the sides of the opposite bar and keep the bars in line with eac-h other and guide them in the working of the wrench. One of the bars A has a recess, E, cut on its inner face to receive the wheel G, which turns on a pin, F, that projects from the other bar, the hole in the wheelwhich receives the said pin being made at one side of its centre, as shown in fig. 3, so that said'wheel is eccentric in its revolutions.

When one desires to operate the wrench it is only necessary to turn the wheel G, which projects on either side of the wrench, s0 that it can easily be worked. As the wheel is revolved its periphery i's brought against the shoulders'oi` recess E, and that side of the wheel which has the greater radius causes the bars to move upon each other in opposite directions so as to enlarge or lessen the space between the several`jaws of the wrench, as required for 'different-sized nuts, Stc. A The periphery of the whcelmay, if desired, be notched or roughened to vincrease friction between it and the shoulders ot the recess, and consequently cause the wheel the better to remain stationary in the slot or recess E after adjustment.

What I claim as new, and desire to secure by Letters Patent, is-

r,[he combination ofthe eccentric-wheel G, the pin F, projecting from one part, A, of the wrench, and the recess or slot E in the other part A, substantially as shown.

JAMES E. GRQNK.

Witnesses:

W. A. PALMER, A. M. Banen.. 

